RDR2 by far but it's kind of an unfair comparison considering their settings. Horizon was more daring with a blend of modern post apocalyptic, futuristic and prehistoric imagery which varied in quality. Like the environments and machines looked amazing but I thought the character designs were pretty bad, the main city felt lifeless and there was a distinct lack of environmental storytelling. Meanwhile Rockstar is used to making high quality open worlds and they had every reference in the world to make the game look perfect.